This ActiveRecord plugin saves formatted content (Markdown, Textile, HTML) after normalizing it.

Hiki renderer plugin for the redcarpet. You can convert Markdown to Hiki easier.

A command line utility for markdown fun

Realtime Github Flavored Markdown Preview with WebSocket

Literate Programming for Ruby / Markdown.

Sanitize markdown according to a set of rules.

Generator for turning a directory hierarchy of markdown files into a static set of HTML pages. It's targeted at providing online help for web application.

Sinatra Based Markdown blog.

jotdown is a short markdown

A (Markdown -> PDF) converter written in Ruby.

SimpleMDE markdown editor for rails.

Lessons Indexer for Learnable. Build index, adds headings, generates PDFs from Markdown and pushes to GitHub.

A little helper to write markdown in ruby.

Enchaine is a command-line tool to change Markdown headers (# or ===) to cryptographic hashes for aesthetic reasons. Various hashes, representations, and strategies for applying them can be specified.

HTML to markdown converter

Include snippets of text from external files into your markdown

Hamdown converts a markdown file to html and plops it into a haml template

generate summary for markdown.

Convert Github flavored Markdown into HTML.

Write posts in Markdown, publish a static blog in HTML